it's a 1974 400, two freeze plug block aka {cheaters block} it's complete except cam the block casting # is 330817 its a 2 bolt main. looking to get 250.00 or best offer for local pick up only. located in east hartford ,ct. the block is taken apart. email me at cgalloirocz@yahoo.com or call me @ 860-995-7159 or pm me. serious offers only please..i also have a complete 350 4bolt ready to be rebuilt, and a 350 4 bolt .030 over ready to be bulit. The 350 4 bolt .030 over block # is 3970010 . make an offer...